Hi there,
I have a transmitter circuit, which i want to connect to the parallel port of a computer. The reason is to trigger the transmitter when the parallel port pin is set to high.
I am using the configuration that is shown in the attachment, but when i measure the voltage across the collector to the emitter, it seems like the drop is equals to 9V, which is the Vcc.
So any suggestion what to do? and is my approach correct? the original transmitter circuit is with a push switch, and now i am using the relay to short the loop when the parallel port pin is set to high..
very urgent. thanks in advance.
I have a transmitter circuit, which i want to connect to the parallel port of a computer. The reason is to trigger the transmitter when the parallel port pin is set to high.
I am using the configuration that is shown in the attachment, but when i measure the voltage across the collector to the emitter, it seems like the drop is equals to 9V, which is the Vcc.
So any suggestion what to do? and is my approach correct? the original transmitter circuit is with a push switch, and now i am using the relay to short the loop when the parallel port pin is set to high..
very urgent. thanks in advance.